Re: "aborting sbp2 command" expected in kernel.org FireWire maybe

Pat LaVarre wrote:
> How do I build 2.6 Linux from kernel.org that does read at speed without
> "aborting sbp2 command"?

First thing to try is to switch serialization on for sbp2.
See the sbp2 documentation at www.linux1394.org.

If that does not help, replace linux-2.6/drivers/ieee1394 by the trunk
directory from the Subversion repo at linux1394.org.

If there are still problems, remove all non-essential kernel options.

> I ask because I have a disc whose outside spins at 25.3 MB/s. With my
> PC, Knoppix Linux-2.4.26 consistently reads hundreds of MiB thru
> FireWire at within three percent of that rate. Knoppix Linux-2.6.6
> consistently reads at 55% below that rate, but does consistently read
> without "aborting sbp2 command".

Sbp2 should perform nearly the same under kernel 2.4 and 2.6. In fact, I
found once that reading from CD-ROM is much improved under kernel 2.6
compared to 2.4.

The "aborting sbp2 command" errors are serious scsi transport problems
which may even lead to data corruption. Alas there is a multitude of
possible causes for this type of error. Sometimes people don't
experience data corruption, just a considerable slow-down accompanied by
these messages. Still, it is a serious error condition AFAIU.

> I conclude all my hardware is ok - my issue is FireWire kernel source.

That, or the newer kernel reveals a subtle compatibility problem with
the device's firmware that was masked in the earlier kernels. However
kernel bugs are more likely.

> I'm told Knoppix is of the Debian family. I first tried FireWire in a
> kernel.org Linux because a friend relayed to me rumours of trouble. Me,
> I tried 2.6.9-rc1-bk2 and then stepped back as far as the 2.6.6 of
> 2004-05. No joy yet.
>
> How do I build 2.6 Linux from kernel.org that does read at speed without
> "aborting sbp2 command"?

I am successfully using 2.6.8-rc2 and 2.6.8.1 with replaced 1394 drivers
ever since 2.6.8-rc2 was available. I use it on a single-processor x86
machine with a VIA OHCI controller, 3 different harddisks, 2 different
CD-RWs, and a hub. I posted the config that I used for 2.6.8-rc2 here:
http://me.in-berlin.de/~s5r6/k-config-2004-07-21

-- 
Stefan Richter
http://arcgraph.de/sr/
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